Measures of the Spread of the Data · Exercise 27

X = the number of days per week that 100 clients use a particular exercise facility.
$$\begin{array}{cc}\text{x}& \text{Frequency}\\ \text{0}& \text{3}\\ \text{1}& \text{12}\\ \text{2}& \text{33}\\ \text{3}& \text{28}\\ \text{4}& \text{11}\\ \text{5}& \text{9}\\ \text{6}& \text{4}\end{array}$$

The 80^th percentile is _____

(a) 5
(b) 80
(c) 3
(d) 4

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Introductory Statistics 2e · §2.7 Measures of the Spread of the Data · Exercise 27